Copilot CLI Infinite Loop on Empty bash Tool Call #1444
Description
Describe the bug
The Copilot CLI gets stuck when invoking a bash command with empty arguments. The command is invalid and results in an error, but instead of stopping, it repeatedly issues the same tool call over 5000 times until the process is eventually killed.
Specifically, the model keeps generating the following tool call with empty arguments:
{
"choices": [
{
"finish_reason": "length",
"message": {
"role": "assistant",
"tool_calls": [
{
"function": {
"arguments": "{}",
"name": "bash"
},
"id": "toolu_vrtx_01X5EZSmMahBSaU8p21MvQH8",
"type": "function"
}
]
}
}
],
"created": 1770869340,
"id": "msg_vrtx_012HHnioZgNQg77QVLyuDMJ8",
"usage": {
"completion_tokens": 16000,
"prompt_tokens": 32127,
"prompt_tokens_details": {
"cached_tokens": 31973
},
"total_tokens": 48127
},
"model": "claude-sonnet-4.5"
}
Let me know if you want more information.
Affected version
0.0.407-1
Steps to reproduce the behavior
No response
Expected behavior
If the tool call is failure, shall llm correct it?
Additional context
No response